50991

Appears in sequences

• Number of legal Go positions on a 1 X n board (for which 3^n is a trivial upper bound).at n=10A102620
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 259", based on the 5-celled von Neumann neighborhood.at n=42A271056